Fair Value Of Assets And Liabilities Common Stock Subject to Repurchase Level 3 Rollforward (Details) (Level 3, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 29, 2013
Level 3
Fair Value, Temporary Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, September 28, 2012	$ 167,461
Issuances of Parent Company common stock	1,872
Repurchases of Parent Company common stock	(24,893)
Change in fair market value of Parent Company common stock	6,147
Balance, March 29, 2013	$ 150,587